Ugh it's doing it continually now, over and over, every few seconds. What the heck is it? As you say it dims then gets brighter again. Always dims for a second then immediately jumps up to the brightness it was before.Have noticed mine dim a little then get a tad brighter again...didnt think anything of it until you mentioned..mine dosnt seem to do it that often, well if it does then im not noticing but it did do it just now when surfing the net.
If it keeps doing it it's going back. It's insanely jarring when I'm working or browsing or whatever.
Why are monitors so riddled with flaws these days